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Tubing OD

post #1 of 22
Thread Starter 
Hi Everyone,

I'm going to be using a MCR 120 rad, the fittings are 3/8, so that means I'll be using 3/8 ID....easy enough, but, I've been searching literally all day to figure out what my OD should be, and I've come up empty handed.

If someone could shed a little light on the subject I'd be very appreciative, and also what determines the size of the OD?

Thank You,

Flinch
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post #2 of 22
either a 5/8" or 1/2'' OD.
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post #3 of 22
Thread Starter 
Thank you froggy, can you explain to me what determines what OD one should go with?

Thanks
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post #4 of 22
Is there such thing as 1/2" OD for 3/8" tubing? I havent seen it. 1/2" OD would mean that the wall of the tubing is only 1/16". This is quite thin, and the pump might suck in the tubing. 5/8" wall would be your ideal, as it would have 1/8" wall thickness.

The difference between the two would be that the 5/8" is a little harder to make tight turns, but its more stable. 1/2" would be good for tight spaces, or where you needed to make a lot of tight turns. However on those turns you may develop kinks due to the small wall thickness.
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post #5 of 22
With 3/8ths ID the OD thickness of the tube isn't as crucial as the larger ½"ID.
Just subtract the ID from the OD and divide that by 2 to arrive at the tube thickness.

Example:
½"ID x 3/4"OD = 1/8th inch wall thickness.

With larger tubing a thicker wall equates to more difficult routing inside of case.
But with 3/8"ID, thicker equates to tighter bends with less chance of kinking/collapse.

IMO the only reason for thin walled 3/8"ID tubing would be press fit/quick disconnects.
  
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post #6 of 22
just how tight do you want to make the turns?

Even my 1/2" ID Tygon tubing is really easy to bend into small circles, and if you wanted to go crazy with it just use coils.
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post #7 of 22
Thread Starter 
Thanks guys, I do believe you've saved my sanity.

What I'm doing is modding an existing Nautilus 500 with the MCR 120 and Apogee GT.....it's strictly for my cpu. I'll be confined a bit in the external case, so I'm going to have to be somewhat creative with the dremel.

I guess I'll be going with some ClearFLEX 60 3/8ID and 5/8 OD

Again, I really appreciate all your help.

Flinch
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post #8 of 22
Good choice and good luck with your external system.
  
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post #9 of 22
Thread Starter 
Thanks Dryadsoul,

I'll keep updates on it's progress
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post #10 of 22
The thicker the sidewall thickness the tighter the radius you can bend before you have kinking problems:

Check out the table at the bottom of this page:

http://www.sidewindercomputers.com/tubing.html

R3603

1/2" OD would get you a 1-1/2" minimum bend radius

5/8" OD would get you a 1-1/8" minimum bend radius

Coolsleeves will help with this, but go with the thicker walls if you can fit them where you need to.
    
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